John Campion

John Campion
Gardiner Roberts LLP
ADR, Civil Litigation, Commercial Litigation, Corporate

John Campion, partner with the Toronto-based firm Gardiner Roberts LLP and certified Law Society of Ontario specialist in civil law, focuses on business and corporate/commercial law, as well as litigation and dispute resolution.

He graduated with a Bachelor of Arts in economics from Western University in 1967 and earned his Juris Doctor from the University of Toronto in 1972. Mr. Campion was called to both the Ontario Bar and the Northwest Territories Bar in 1974.

In addition, he completed the advanced mediation course from Harvard University in 2015.

A prominent trial, appeal, and arbitration counsel, Mr. Campion handles such matters as, shareholder disputes, negligence, fraud, class actions, intellectual property, copyright, patents, economic regulation, securities, pensions, estates and competition.

He has appeared before all levels of trial and appellate courts across Canada, representing clients in such industries as transportation, energy, mining, construction, insurance, and environment.

Mr. Campion has been counsel before various tribunals, such as the securities, competition, transportation, and elections tribunals.

He has been counsel to the Ontario Energy Board, the Automobile Insurance Board, the Pension Commission, the Federal Commissioner of Competition, the Minister of Justice, the Prime Minister of Canada, the director of the Canadian Broadcasting Corporation, as well as acted for municipal, provincial, and federal candidates and leaders.

Mr. Campion has also been an emeritus bencher and elected bencher of the Law Society of Ontario since 2000 and was president of the Federation of Law Societies of Canada and The Empire Club of Canada.

He is a fellow of the Chartered Institute of Arbitrators, the Litigation Counsel of America, and the American Bar Foundation.

For more than 20 years, Mr. Campion was an adjunct professor of law at Osgoode Hall Law School and the University of Toronto.

He is a co-author of Professional Liability in Canada and Class Actions in Canada, and lectures across Canada and internationally.

John Campion Posts

Tips for successfully defending against class actions

Toronto civil litigator John Campion has been defending institutions against class actions almost from the inception of Ontario’s class proceedings regime more than 25 years ago. Read more

Legal legend Campion has done it all during five decades in law

Toronto civil litigator John Campion calls himself the Forrest Gump of 1968. Read more